This car is remarkable. First of all, it was designed directly by BMW, although the bodywork was done in the factory in Sindelfingen by Daimler-Benz. The chassis is strongly improved as compared to its much critized predecessor. Another feature is the new in line-6-cylinder engine with four-bearing crankshaft, a major leap as compared to its predecessor's double-bearing four cylinder.

In terms of design, the 303 displays for the first time, the double grille. It originates because BMW rounds the grill aerodynamically, resulting in a divided surface. Another reason for the rounding is the positioning of the propeller. The double grille grows into being one of the design features of BMW in the coming years, and still is today.